12 Large Spools BASIC Embroidery Machine Thread RT 12 Spools BASIC/PRIMARY Embroidery Machine Thread This auction is for 12 Spools Of Basic/Primary Colors Embroidery Machine Thread, It is 40 Weight Polyester. Each Spool has 1100 yards About Embroidex Threads, These Threads are of highest Quality. They are comparable to the threads you buy at your local dealer for $5-$6 a pc. We have put together kits and sell them for a quarter of the price.